All of those requirements can be met by choosing the correct motor, speed controller and battery... with the possible exception of total weight while getting 15 min duration.

Braking function of the speed controller would work for slowing the rotor and minimizing rotation, but it won't lock the rotor.
Maximum braking is by shorting the 3 wires of a brushless motor. That will resist rotation very effectively, but strong wind will still windmill the rotor and could burn out the motor windings. You can do nearly as well with a resistor bridge (carefully chosen resistors) and the resistance will protect the motor.